Answer:
v = 2m/s
Explanation:
V = u + at
Where v = final velocity
u = initial velocity
a = acceleration
t = time
Given u = 12m/s
a = -2.5m/s^2
t = 4 secs
Therefore
v = 12 + (-2.5 x 4)
v = 12 + (-10)
Positive negative gives negative. So the positive sign changes to negative sign
v = 12 - 10
v = 2m/s